ring the summer months, when moisture-laden winds blow from the
ocean over the land, and a dry season during the winter months, when
dry winds blow from the Asian land mass back to the ocean

Terrain: surface currents in the northern Pacific are dominated by a
clockwise, warm-water gyre (broad circular system of currents) and in
the southern Pacific by a counterclockwise, cool-water gyre; in the
northern Pacific sea ice forms in the Bering Sea and Sea of Okhotsk in
winter; in the southern Pacific sea ice from Antarctica reaches its
northernmost extent in October; the ocean floor in the eastern Pacific
is dominated by the East Pacific Rise, while the western Pacific is
dissected by deep trenches, including the world's deepest, the 10,924
meter Marianas Trench

Natural resources: oil and gas fields, polymetallic nodules, sand and
gravel aggregates, placer deposits, fish

Environment:
current issues: endangered marine species include the dugong, sea
lion, sea otter, seals, turtles, and whales; oil pollution in
Philippine Sea and South China Sea
natural hazards: surrounded by a zone of violent volcanic and
earthquake activity sometimes referred to as the Pacific Ring of Fire;
subject to tropical cyclones (typhoons) in southeast and east Asia
from May to December (most frequent from July to October); tropical
cyclones (hurricanes) may form south of Mexico and strike Central
America and Mexico from June to October (most common in August and
September); southern shipping lanes subject to icebergs from
Antarctica; occasional El Nino phenomenon occurs off the coast of Peru
when the trade winds slacken and the warm Equatorial Countercurrent
moves south, killing the plankton that is the primary food source for
anchovies; consequently, the anchovies move to better feeding grounds,
causing resident marine birds to starve by the thousands because of
their lost food source; ships subject to superstructure icing in
extreme north from October to May and in extreme south from May to
October; persistent fog in the northern Pacific can be a maritime
hazard from June to December
international agreements: NA

Note: the major choke points are the Bering Strait, Panama Canal,
Luzon Strait, and the Singapore Strait; the Equator divides the
Pacific Ocean into the North Pacific Ocean and the South Pacific
Ocean; dotted with low coral islands and rugged volcanic islands in
the southwestern Pacific Ocean